Morphology of the Oligoryzomys nigripes respiratory system

Abstract

Rodents are important in the transmission of infectious diseases that affect the respiratory tract, including simple infections and those caused by specific pathogens. These animals are natural reservoirs of zoonoses that cause many public health diseases. Basic knowledge on the morphology of these animals is important as basic research is useful for applied studies, such as the development of clinical, therapeutic, surgical and clinical models. Morphological data of respiratory tract in Oligoryzomys nigripes are absent in the literature. Therefore, the aim of this study was to perform a morphological analysis of the respiratory tract of O. nigripes. Five adult females from the environmental reserve in São Joaquim da Barra, São Paulo were used, donated to the Museum of Veterinary Anatomy (FMVZ/USP). Several morphological features follow the same pattern seen in rodents; however, this species showed some differences such as the presence of three lobar bronchi, nonlobed left lung and the right lung constituted by two lobes. Respiratory epithelium lined the whole respiratory tract and was seen using scanning electron microscopy the oval shape of the parenchyma and alveoli.

Macroscopic and microscopic morphology of the trachea and lungs of giant anteater (Myrmecophaga tridactyla)

“…Although this segment is short, it is also covered by the mandibular salivary gland. In the present study, tracheal mucosa was coated by the respiratory epithelium and had serous glands, similar to the description made for domestic (Banks 1993) and wild species (Moussa & Hassan 2015, Rocha et al 2017, Mario et al 2018. The tracheal muscle was inserted in the tracheal cartilage's internal face, similar to horses, pigs, and ruminants, but different from carnivores and humans, whose muscle fixation occurs on the external surface of the tracheal cartilages (Bacha & Bacha 2012, König & Liebich 2016.…”

Histomorphology of the lower respiratory tract in the Indian crested porcupine (Hystrix indica)

“…The larynx of the ICP included cricoid, thyroid and arytenoid cartilages with the corniculate process and epiglottis. The morphology was similar to those for some other rodents, such as Oligoryzomys nigripes , Mus musculus and Rattus norvegicus (Mario et al., 2018; Borgard et al., 2019; Oliveira et al, 2012). In the thyroid cartilage of the ICP, there was a thyroid foramen instead of a thyroid fissure found in some other rodents, including the laboratory rat ( Rattus norvegicus ), kangaroo rat ( Dipodomys ordii ), grasshopper mouse ( Onychomys.…”

“…The trachea of the porcupine was composed of 36–40 incomplete rings with variation in shape and diameter along the length. The number of rings was higher than in other rodents such Oligoryzomys nigripes , with 11 rings (Mario et al., 2018); Cricetomys gambianus , with 21–33 rings; and mole rates, with 30.5 ± 4.5 rings (Ibe et al., 2011; Ilgun et al., 2014).…”

“…The trachea was covered with a pseudostratified ciliated columnar epithelium with hyaline cartilage in Oligoryzomys nigripes (Mario et al., 2018) and ICP. ICP trachea and bronchi epithelium composed of non‐ciliated cells (basal, columnar and cuboidal) and scattered ciliated cells resting on a basement membrane.…”

“…Morphological studies of the structure of the respiratory system are essential to understand vertebrate behaviour and physiology. Accordingly, characterisation of the morphological and histological features of the respiratory system is a major research goal (Fonseca et al, 2017; Mario et al., 2018; Oliveira et al., 2012). Since rodents have the potential to spread zoonotic respiratory diseases, studies of the respiratory system have focused on rats, guinea pigs, mice and others (Enria & Pinheiro, 2000; Calisher et al., 2003; Hill & Brown, 2011; Blagojevic et al, 2018; Ilgun et al., 2014; Treuting & Dintzis, 2012; Yarto‐Jaramillo, 2011).…”